138 FLORIDA GEOLOGICAL SURVEY-i5TH ANNUAL RI PORT


ville, was tested by the Bureau of Standards in 19141. The ,results of these tests indicate that it may be used for face and common brick, hollow blocks, drain tile, etc. Its physical properties are:

 Physical Properties of Platt Bros. South Jacksonville Clay, Bureau of Standards (Sample No. r,).
 Plasticity .......................... G ood.
 W ater of plasticity................. 27.4%
 Linear air shrinkage ............... 6.2%
 Fire tests:
 Temperature. Linear Shr. Porosity. Color.
 Per Cent. Per Cent.
 9901C. 0.05 28.1 Red.
 1020 26.8 Red.
 1050 25.7 Red.
 1080 25.8 Red.
 1110 0.827 24.8 Red.
 1140 24.6 Red.
 1170 22.5 Red.
 1200 22.5 Red.
 1230 2.34 20.4 Red.
 1260 16.6 Red.
 1290 11.5 Red.
 1320 3.97 7.5 Red.


 ESCAMBIA COUNTY

 Escambia County lies between the Escambia and the Perdido rivers in the extreme western end of the State. Its surface exposures are chiefly sands and clays of Pliocene and Pleistocene age. From the ceramic viewpoint this county is perhaps the most interesting one in the State; its clay deposits are numerous and widely distributed and these range in quality from common. brick to stoneware and terra-cotta clays. Face and common brick, turpentine cups and some pottery are now being made from Escambia County clays and a pottery formerly located in Pensacola made jugs and other forms of stoneware from local deposits.
 Clays from Escambia County have probably been known and used longer than any others in Florida. Clay from Pensacola was shipped to Josiah Wedgewood2 in England in 1766 for experimental work in his pottery. Williams3 states that brick were being manufactured in West Florida prior to 1827 and cargoes of them were being shipped

 lSellards, E. H., Report on Clay Tests for Paving Brick, Fla. Geol. Survey Press Bull. No. 7, 1915.
 2Meteyard, Eliza, Life of Josiah Wedgewood, Vol. I, p. 471, 1865.
 3Williams, John L., West Florida, p. 69, 1827.